How to set Opacity Maps with colored tga textures?
It looks to me like the alpha is in the blue channel of those images.


To use it in cycles just add a Seperate RGB node in between the image and where you normally would plug the alpha in (probably the Fac in a mix node).



I'm guessing the other colors are kind of an id map (just other parts of the texture segregated) so you can apply different shaders to different parts. And example is the "corvete" sticker on the right side. If you wanted to make the letters less shiny then the rest of the sticker, then you have a texture to use for that.



This is really nothing more then putting mutipal black and white texture maps into one color image.